HYDRAULIC INSTALLATION
Hydraulic installation kits are available for virtually all compatible backhoe loaders,
excavators and skid steers from the manufacturer.
Complete parts and instructions for NPK designed hydraulic installation including valves
and/or controls, hoses and fittings, boom and stick tubing, and clamps can be provided.
BACKHOE/EXCAVATOR HAMMER LINES
Typically, the pressure line should be arranged on the left side of the boom and routed
to the hammer “IN” port (6) and the return line is routed from the hammer “OUT” port
(5) on the right side. Flow to the hammer is controlled from the carrier’s auxiliary valve
or from an NPK supplied flow valve. Hydraulic oil is generally routed back to the tank
thru the carrier’s oil cooler and filter.
SKID STEER HAMMER LINES
Flow to the hammer (m3) is directed from an
auxiliary valve on the skid steer. NPK hammer
ports are marked “IN” and “OUT”. Return oil
(m4) is routed back to tank through the skid
steer return hydraulic circuit.
HAMMER CONTROL VALVE
There are two general types of control systems
depending on the carrier model:
1. CONTROL SYSTEM USING THE CARRIER AUXILIARY OR SPARE VALVE
SECTION.
This type of installation utilizes an existing carrier valve. Any additional parts, such
as a mechanical linkage, hydraulic pilot actuators, flow control valves, etc., are
supplied by the hydraulic kit supplier. NOTE: Special pressure control valves are not
required. The NPK hammer operating pressure is self-regulating.
2. CONTROL SYSTEM USING THE NPK FLOW VALVE (MULTIVALVE).
For carriers not equipped with a suitable auxiliary or spare valve section, NPK can
provide a solenoid operated, priority flow control valve to operate the NPK hammer.
The NPK multivalve is specifically designed for the operation of boom mounted
attachments.
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